Radeon HD 2600XT can do GDDR4

There will be at least two versions of RV630 card. They will
be covered under the Radeon HD 2600XT brand. The biggest difference between
these two XT cards will be the memory as the chip can handle GDDR 3 or GDDR4.
DDR2 is left for slower chips.

The new chip is 65 nanometre, supports DirectX 10, HD Audio,
HDMI, 1080P HD playback. We still don't know about the clock speed of this chip
but it might be even faster than 800 MHz.

The funny thing is that some overclocked versions of the
cards can handle even GDDR 4 but the bad side of the story is that the memory
interface is still 128 bit only.